add missing FreeType 2 dependency to RPM

http://pkgs.org/download/freetype2
we don't ship non-managed code anymore
add SDL2 as soft dependency to RPM

http://pkgs.org/download/SDL2
add SDL2 as soft dependency to DEB

http://pkgs.org/download/libsdl2-2.0-0
add regular SDL2 dependency on rolling release Arch PKG

https://www.archlinux.org/packages/extra/i686/sdl2/
try to fix sed: -e expression #1,  unterminated `s' command